PARALLEL-SERIES LED LIGHT STRING
Disclosed is a LED light string that uses parallel connected resistors that are connected across the leads of the LEDs in a light string and are disposed in the socket of the LED lamp holder. The use of parallel connected resistors across the leads of the LEDs greatly enhances the reliability of the light string.
Late emitting diodes (LEDs) have been widely used as decorative lighting sources because of their physical properties, such as low power consumption, small size and extended lifetime. The market for decorative LED light strings is large.
Currently, most of the conventional LED light strings use a serial structure such as illustrated in
To overcome the disadvantages of the series wired LED structure 100 illustrated in
A disadvantage with respect to the circuit illustrated in
An embodiment of the present invention may therefore comprise a parallel-series wired light string comprising: a first parallel connector that is connected between an input and an output; a second parallel connector connected between the input and the output; a first resistor that is wired in series in the first parallel connector; a plurality of LED modules wired in series in the first parallel connector, the LED modules comprising: a LED having leads; a LED holder; a second resistor disposed in the LED holder that is wired in parallel with the LED across the leads.
An embodiment of the present invention may further comprise a method of manufacturing a light string comprising: connecting a first parallel connector to an input and an output; connecting a second parallel connector to the input and the output; wiring a resistor in series in the first parallel connector; providing a plurality of LED modules having LED holders with resistors and LEDs disposed in the LED holders; wiring the resistors across leads of the LEDs in parallel with the LEDs; wiring the plurality of LED modules in series in the first parallel connector.
An embodiment of the present invention may further comprise a parallel-series wired light string comprising: a first parallel connector that is connected between an input and an output; a second parallel connector connected between the input and the output; a resistor that is wired in series in the first parallel connector; a plurality of LED modules wired in series in the first parallel connector, the LED modules comprising: a LED having leads and a LED forward breakdown voltage; a LED holder; a diode disposed in the LED holder that is wired in parallel with the LED across the leads, the diode having a diode forward breakdown voltage that is higher than the LED forward breakdown voltage.
An embodiment of the present invention may further comprise a method of manufacturing a light string comprising: connecting a first parallel connector to an input and an output; connecting a second parallel connector to the input and the output; wiring a resistor in series in the first parallel connector; providing a plurality of LED modules having LED holders with diodes and LEDs disposed in the LED holders; wiring the diodes across leads of the LEDs in parallel with the LEDs; wiring the diodes across leads of the LEDs in parallel with the LEDs; wiring the plurality of LED modules in series in the first parallel connector.
The parallel connected LED and resistors of each of the modules are packaged together in the lamp holder, such as a lamp socket, during manufacture. In this fashion, the cost of an additional wire is eliminated, thereby substantially reducing the cost of the parallel-series circuit 300, illustrated in
As shown in
As shown in
The foregoing description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. It is intended that the appended claims be construed to include other alternative embodiments of the invention except insofar as limited by the prior art.
Claims
1. A series wired light string comprising:
- a first parallel connector that is connected between an input and an output;
- a second parallel connector connected between said input and said output;
- a light string connector that is connected to said first parallel connector at a first node near said input and that is connected to a second parallel connector at a second node near said output;
- a plurality of LED modules wired in series in said light string connector, said LED modules comprising: a LED having leads; a lamp holder; a bypass component disposed in said LED holder that is wired in parallel with said LED across said leads.
2. The light string of claim 1 wherein said bypass component is a discrete component.
3. The light string of claim 2 wherein said bypass component is further comprising an additional resistor that is connected in series in said light string connector.
4. The light string of claim 3 wherein said input comprises a plug and said output comprises a socket.
5. A method of manufacturing a light string comprising:
- connecting a first parallel connector to an input and an output;
- connecting a second parallel connector to said input and said output;
- connecting a light string connector to said first parallel connector near said input;
- connecting said light string connector to said second parallel connector near said output;
- providing a plurality of LED modules having LED holders with resistors and LEDs disposed in said LED holders;
- wiring said resistors across leads of said LEDs in parallel with said LEDs;
- wiring said plurality of LED modules in series in said light string connector.
6. The method of claim 5 farther comprising:
- providing said input as a plug;
- providing said output as a socket.
7. The method of claim 6 further comprising:
- wiring an additional resistor in series in said light string connector.
8. A parallel-series wired light string comprising:
- a first parallel connector that is connected between an input and an output;
- a second parallel connector connected between said input and said output;
- a light string connector that is connected to said parallel connector at a first node near said input and that is connected to a second parallel connector at a second node near said output;
- a first resistor that is wired in series in said light string connector;
- a plurality of LED modules that are wired in series in said light string connector, said LED modules comprising: a LED having leads and a LED forward breakdown voltage; a LED holder; a diode disposed in said LED holder that is wired in parallel with said LED across said leads, said diode having a diode forward breakdown voltage that is higher than said LED forward breakdown voltage.
9. The light string of claim 8 wherein said input comprises a plug and said output comprises a socket.
10. The light string of claim 9 further comprising:
- a resistor that is wired in series in said light string connector.
11. A method of manufacturing a light string comprising:
- connecting a first parallel connector to an input and an output;
- connecting a second parallel connector to said input and said output;
- connecting a light string connector to said first parallel connector near said input;
- connecting said light string connector to said second parallel connector near said output;
- providing a plurality of LED modules having LED holders with diodes and LEDs disposed in said LED holders;
- wiring said diodes across leads of said LEDs in parallel with said LEDs;
- wiring said plurality of LED modules in series in said first parallel connector.
12. The method of claim 11 further comprising:
- providing said input as a plug;
- providing said output as a socket;
- wiring an additional resistor in series in said light string connector.
Type: Application
Filed: Jul 31, 2006
Publication Date: Jan 31, 2008
Inventor: JINGJING YU (Vancouver)
Application Number: 11/461,293
International Classification: F21S 13/14 (20060101);